add office 2010 mime types, fix js mime type

Change-Id: I73999da738d7503453dab2d8929a848c9be6ec5e
Reviewed-on: https://git.eclipse.org/r/38130
Tested-by: Hudson CI
Reviewed-by: Ivan Motsch <ivan.motsch@bsiag.com>
Tested-by: Ivan Motsch <ivan.motsch@bsiag.com>
add add-on concept to desktop

Change-Id: I7ea7f2999bebcb70fe52f5f84e7171954f93d540
Reviewed-on: https://git.eclipse.org/r/38131
Tested-by: Hudson CI
Reviewed-by: Ivan Motsch <ivan.motsch@bsiag.com>
Tested-by: Ivan Motsch <ivan.motsch@bsiag.com>
add new initCustomParams operation to client session

Change-Id: Iea0fe64b38e4c36888052713213709c05cb29cbe
Reviewed-on: https://git.eclipse.org/r/38134
Reviewed-by: Ivan Motsch <ivan.motsch@bsiag.com>
Tested-by: Ivan Motsch <ivan.motsch@bsiag.com>